Choose the food item correctly matched with its common adulterant.

The correct option is D

Black pepper- Papaya seeds

All options are correct.

Explanation of correct options:

1. Mustard seeds are often adulterated with Argemone seeds.
2. Butter is usually adulterated with mutton and beef fats, hydrogenated vegetable oil, buttermilk, wheat, maize dough, etc.
3. Urea is added to milk intentionally or by adding synthetic milk to natural milk.
4. Black pepper is adulterated with papaya seeds because of low cost and morphological similarities.

Final answer: Food items with their common adulterant are:

1. Mustard seed- Argemone seeds
2. Butter- Vanaspati
3. Milk- urea
4. Black pepper- Papaya seeds